
function collapse_expand(id, elm) {
    if (E(id).style.display === "none") {
        E(id).style.display = "";
        elm.firstChild.src = "img/list-remove.png";
        C(id, "1");
    } else {
        E(id).style.display = "none";
        elm.firstChild.src = "img/list-add.png";
        C(id, "0");
    }
}
